import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

class MyCallable implements Callable<Integer> {

    @Override
    public Integer call() throws Exception {
        int sum=0;
        for(int i=1;i<=100;i++){
            sum=sum+i;
        }
        return sum;
    }
}
public class demo49 {

    public static void main(String[] args) throws InterruptedException, ExecutionException {
        MyCallable myCallable=new MyCallable();
        FutureTask<Integer> futureTask=new FutureTask<>(myCallable);
        Thread t=new Thread(futureTask);
        t.start();
        t.join();
        System.out.println("sum="+futureTask.get());

    }
}
